Hot-air furnace



(No Model.)

A. J. ERWIN. HOT AIR FURNAGE.

No. 505,096. Patented Sept. 19, 1893.

z f I i I AA y/lf J r UNITED STATES PATENT OFFICE.

ALEXANDER J. ERWIN, OF MANSFIELD, OHIO.

HOT-Al R FU RNAC E.

SPECIFICATION forming part of Letters Patent No. 505,096, datedSeptember 19, 1893.

Application filed February '7. 1893- Serial No. 461,327. (No model.)

To all whom it may concern: Be it known that I, ALEXANDER J. ERWIN, acitizen of the United States, residing at Mansfield, in-the county ofRichland and State of Ohio, have invented certain new and usefulImprovements in Hot-Air Furnaces; andIdo hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of thisspecification.

My invention relates to improvements in hot air furnaces and the objectsof my invention are: first, to so construct a furnace that will obviatethe necessity of using a cold air 1 duct; second, to take the cooler airfrom the durable and efficient means for the purpose stated.

In the accompanying drawings Figure 1 is aprospective view of myimproved hot air furnace, showing the air ducts or pipes broken away.Fig. 2 is a vertical, longitudinal, sectional view of the same showingthe general construction. Fig. 3 is a sectional view of one of the airducts, attached to the register, showing a partition extending the fulllength which forms inlet and outlet ducts.

7 Similar letters referto similarparts throu ghout the several views.

In the accompanying drawings A indicates the furnace which is composedof an inner and outer case, B and C, which are constructed of sheetsteel. The inner case, B, is about twelve inches smaller in dimensionthat the outer case, 0, which forms an air chamber, D, between the twocases. The inner case, B, is provided with crown sheet or head, E, whichis air tight. This forms the fire box which is provided with the grate,F, and fire clay lining, G, extending a certain distance up to form afire pot and prevent the fires from burning the sheet steel. The outercase, 0, is also provided with an air-tight head, H, and a crown cap, I,to retain the heat.

J indicates a partition which is placed between the inner and outercases which form the chamber, D, into two compartments, K and L. Thesaid partition extends to the bottom of the case and is provided nearthe bottom with perforations, M. The said partition extends upward andis provided with a heavy cap, N, the said cap being provided with acenter opening, 0.

The outer case, 0, is provided with a number of air pipes, P, the numbersufficient to supply the number of rooms to be heated. The said pipesare constructed with a partition, R, running longitudinally there thewhole length forming the one pipe into two,- one above the other. Thesaid pipes extend from the furnace to the registers in the floor of therooms. The register opening, S, is constructed with a partition, T,which connects with the partition, R, in the pipe, P.

The description and illustrations fully show and describe theconstruction of my improved furnace.

It will be readily seen that the only way to supply the hot air to therooms is to draw the cooler air from the rooms. The lower tube, R,supplies the furnace with the cool air. There being a greater amount ofheat in the inner chamber, L, than the outer chamber, K, the radiationwill draw the air from the outer to the inner chamber through theperforations, M, thence upward through the opening, 0, in the partition,N, thence up the upper tubes, L, Z, and through the register into theroom.

- It will be readily seen by this construction that I accomplish threeimportant results: First, I have not to heat air at a low tempera ture,the air passing into the furnace being but a few degrees cooler than theair passing from the same. Second, I draw all impure air from the roomsand purify the same by passing through the furnace. Third, the air beingwarm air in the place of cold air, it does not take as much fuel to heatthe same, saving a certain percentage in consumption of coal.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is

The furnace herein shown and described,

consisting of the base, the fire pot thereon,the ters communicating withthe heating and closed casing surrounding the fire pot, the supplypipes. casing inclosing said closed casing having In testimony whereof Iaflix my signature 1n openings at the lower portion and upperporpresence of two Witnesses.

tion, a heat conducting chamber above the ALEXANDER J. ERWIN. lattercasing, a heating pipe leading from the Witnesses:

said chamber a cold air supply pipe leading I. S. DONNELL,

to the casing having the openings, and regis- SAML. MARRIOTT.

